diff --git a/lib/sqlite3.js b/lib/sqlite3.js
index c8e3e8c6c..5d0bdd1df 100644
--- a/lib/sqlite3.js
+++ b/lib/sqlite3.js
@@ -23,6 +23,9 @@ function normalizeMethod (fn) {
 }
 
 function inherits(target, source) {
+    if (target == null)
+        return;
+
     for (var k in source.prototype)
         target.prototype[k] = source.prototype[k];
 }